Carburetor



April 19, 193,8'.

E. A. RuLLlsoN ET AL 2,114,970'

CARBURETOR Filed Jan. 28, 19:56 s shee'gs-sheet 1 6l# 25 :1m l y Z8 IH'i@ '1 Z629 f5 28 y Z7 I4 l||| I4 V 1` i mul I W22 /0 A Il y: V3! o 294g' 30 44C. I i l /6 l 5259 5?* I Q (D 37 49 38 5? 60 |I 48 5l /Z Afro RN Ems Apnl 19, 193s.

E. A. RuLLl'soN ET AL cARBuREToR Filed Jan. 28, 12936l 3 Sheets-Sheet 2ATTORNEYS April 19, 1938. l E. A.V RuLLlsoN ET AL 2,114,970

CARBURETOR Filed Jan. 2s, 1936 s sheets-*sheet 3 ATTORN EY Patented pl'.19, 1938 1,114,910 oAaBURE'ron Earl A. Rnllison and Howard B. Simmons,Toledo,

Ohio, assignors to The Tillotson Manufactuing Company, Toledo, Ohio, acorporation of Ohio Application January 28, 1936, Serial No; 61,197 13claims. (ci. 261454) UNITED STATES 13.Ii'lerslszrioI-*Fil:

of the enginewith which the device may be uti-- lized whereby theefficiency of an arrangement of this character is greatly increased.

The invention contemplates the provision of a carburetor having a mixingpassage embodying flexible walls which automatically provide a sub- 15stantially constant high air velocity.

Another object is the provision of a multi-jet construction ofcarburetors wherein more than one jet is contained in a/ removableelement, the outlets or jets being arranged to obtain a maximum outletarea and at the same` time presenting a minimum restriction in the 'airstream.

lAnother object is the provision of a carburetor having a vplurality ofventuri's and an arrangement of air passage having flexible wallswhereby the carburetor may be used with various sizes'of internalcombustion engines without the necessity of major changes in theconstruction, thus enhancing interchangeability of devices as well as toextend the utilization of the arrangement to various kinds and'sizes ofinternal combustion engines. l

Another object is the provision of a carburetor of this characterwherein the arrangement of venturis and'exible walls ln combination withlthe jets are so positionedvas to obtaina high eiliciency of atomizationof the fuel extruded into the air stream resulting in a more uniformfuel and air mixture. f

Still a further object ofthe invention is the in- 40 corporation in acarburetor of this character of a simple and effective. acceleratingpump and power -jet arrangement, the latter arranged .to extrudeadditional 'fuelinto 'the engine when the throttle is opened or nearlyopened to its maximum position, the accelerating jet being independentof the other fuel orifices leading into the mixing passage;

Still another object of the invention is the provision of multiple jetscontained in one element while the several'fu'el channels necessary toyconvey fuel to the several fuel o riflces are fabricated in a removableelement, thus simplifying the arrangement of the variousjfuel passages.

Another object of the invention is the provisionl mixing passagesurrounding the venturi and principal fuel orifices is fabricated offlexible elements so as to maintain a high velocity ofthe air passingthrough the mixing passage and at the same time centralizing the airstream about 5 the axisof the venturis and the outlets of the main fueloriiices so as to maintain under all conditions of operation a maximumsuction upon the fuel orices.

Still a further object is the provision of a car- 10 buretor wherein thefloat bowl is vented interiorlyv of the mixing passage therebyeliminating any tendency to overenrichening of the mixture should therebe any substantial restriction in the =air horn of the carburetor, asfor example, 15 clogged air cleaners or the like, tending to decreasethe pressure within the mixing passage, and further that such internalventing of the float bowl assures the passage of clean air to the bowlas such'air taken interorly of the carburetor has been cleaned by theair cleaner and fordrawings of a form of the invention, which may bepreferred, in which:

Figure 1 is aside elevational view illustrating 35 one embodiment of thecarburetor of my invention; A.

Figure 2 is a top plan view of the carburetor illustrated in Figure 1;

Figure 3 is a vertical sectional view of the 40 primary and secondaryfuel orices showing the arrangement of main and supplemental venturis;

Figure 4 is a vertical sectional view taken substantiallyon the line 4-4of Figure 2 showing the exble walled passage ofA our invention and 45illustrating the passage of' fuel and the position fof the flexiblewalls when the primary jet is in operation;

Figure 5 is a view similar to Figure 4 showing theposition of theflexible walls of the mixing 50 passage when both primary and secondaryjets are in operation at higherair velocity'arising by reason ofincreased engine speeds; l Figure 6 is a verticalsectional view takenAsubstantially on the line 6-8 of Figure2; 55

Figure 8 is a View taken substantially on the line 8 8 of Figure 1;

Figure 9 is an isometric view showing the arrangement of flexible wallsof the mixing passage forminga part of our invention;

Figure 10 is an isometric view showing the primary and secondary fueljet construction forming an element of the invention;

Figure 11 is a side elevational view of an element embodying fuelpassageways forming a part of the invention;

Figure 12 is an end view of the element shown in Figure 11;

Figure 13 is a vertical sectional view through the element takensubstantially on the line |3I 3 of Figure 12;

Figure 14 is a top plan view of the intermediate body portion of thecarburetor, the view being taken on line I4-I4 of VFigure 1;

Figure 15 is a vertical sectional view taken substantally on the lineI5-I5 of Figure 6 illustrating the channels leading to the idlingorifice.

The carburetion device of our invention is inclusive of a bodystructure, in the present embodiment composed of three principalsections, a middle portion I0, a separable upper portion II carrying achoke control valve arrangement and a lower portion I2, supporting thethrottle valve arrangement. The portions I0, II and I2 have alignedlarge openings forming a mixing pa'ssage I4, the portion I0 being formedwith a laterally extending fuel chamber or reservoir I5 in which ispositioned a float I1 pivoted as at I3, an upwardly projecting arm I9carried by the float adapted to engage a valve member 20 which engages avalve vseat 2| to regulate the supply of fuel entering through the fuelinlet tube 22.

The upper body portion II of the carburetor is formed with a cylindricalair horn or air entrance 25 and formed integrally with portion II is aplate-like extension 2t which forms a cover for the fuel chamber I5'.'I'he lower end of body portion II and extension 25 are formed with aflange which is secured to a mating flange 21 on the body portion I0 bymeans of screws 25, there being a suitable gasket 29 interpositionedbetween the flanges providing an effective seal between the parts.

The intermediate body portion I0 is formed with a ange 30 and the lowerbody portion I2 isformed with a mating flange 24 which are held togetherby means of screws A35, one of which is shown in Figure'l. Positionedadjacent each of the flanges are gaskets 3l and 34 and positionedintermediate gaskets 3I .and'34 are annular` members 32 and 33 formed ofnbre or other suitable heat resisting material. The purpose of thesemembers is to aid in preventing heat from= being transferred from theintake manifold of the engine to the fuel chamber I6 of the carburetor,-

thus decreasing the tendency of the fuel to boil in the fuel chamber.

The lower portion I2 of the carburetor is formed with laterallyprojecting aligned bosses 31 and 38 which are bored to receive a shaft39, the shaft passing diametrically through the mixing passage. In theembodiment illustrated, the central portion of the shaft 39 is providedwith a slot which receives and accommodates a disk valve 4I which issecured in place by means of screws 42.' The valve 4 I serves to control'the flow of mixture to an internal combustion engine with which thedevice may be utilized. A projecting -chamber I5.

end of the shaft 39 receives a lever 44 in the form of a U-shapedmember, the furcations of which have aligned openings through which theshaft 39 projects, the lever being split longitudinally as at 46; aclamping screw 45 engaging nut 49 serving to draw the split portions ofthe lever together so that it is caused to grip the shaft to hold theparts in adjusted position. Positioned intermediate the boss portion 35and the lever 44 is a member 5I carried by the shaft 33 and held inposition thereon by means of a screw 52 which passes through atransverse bore in th'e lever lshaft 39 to hold the member to the shaft.Member 5I is formed with an L-shaped projection 52 which is adapted whenthe throttle is moved to wide open position to determinel the maximumextent of movement by its engagement with the web 53 formed on thecarburetor body. The lower portion of the projection 5I is bored andthreaded to receive a screw 55, the end of the screw being adapted toengage a web portion .55 which determines the idling rposition of theengine by fixing the minimum throttle opening of the valve disk 4I. A'coil spring 51 is interposed between the head of the screw 55 and themember 5I which exerts friction upon the screw to hold the latter inadjusted position. By regulating the .position of screw 55, a Vchangemay be eected in the idling speed of the engine by regulating theposition of the screw 55 with respect to the pad portion 55 formed onthe body portion I2 which acts as stop means with the screw 55 todetermine the idle position of the throttle valve. The upper extremityof the lever 44 is provided with an opening 45 adapted to receivelinkage (not shown) for manipulating the throttle valve. 'The end of theshaft projecting through boss portion 31 receives an arm 6I) which isheld in place by swaging or upsetting the extremity of the shaft. Theupper part II of the carburetor body is provided with a transverselyextending bore which receives a shaft 5 I, the shaft extending acrossthe air passage 52 and carries a choke valve 54 which is held in placeon the shaft by means of screws 55. Positioned at either side of theshaft 5I are small circular valves 55 of mushroom configuration whichnormally close openings 51 in the disk 54. Each disk is secured to aheaded member 53 and surrounded by a comparatively weak coll spring III4which serves to maintain the valves 55 normally in' contact with thesurface of disk 54 closing the openings 51. 'I'he purpose of the springmounted valves 65 is to permit entrance of asmall amount of airimmediately upon starting of the engine into the air passage of thecarburetor when the choke valve 54 is in vclosed or substantially closedposition as the suction of the engine will overcome the slight pressureof the springs 1I to admit air into the passage.

The portion II\ of the carburetor is provided with a vertically arrangedchamber 12 as illustrated in Figure 4 which communicates with the airentrance passage through the medium of a tube 13. The chamber 12 .andtube 13 permit the equalization of pressure in the float bowl Anotherpurpe of an. internal venting of the fuel chamber is that under certainconditions an air cleaner or dust eradicator connected to the airpassage of the carburetor may become clogged, a n d thus set upresistance. to the passage of air through the carburetor, and

yet the pressure in the float bowl and the mixing passage issubstantially equalized by means of the internal channel.

The portion of mixing passage 15 contained 75 in the bocLv I8 ofthecarburetor incorporates a member or cage 18 illustrated particularly inFigure 9 which has a flanged annular portion 11 at its upper end and apair of centrally aligned Venturi tubes 18 and 18. The member 18 in theembodiment illustrated is formed with a plurality of spaced, depending,triangular, integral portions 8|, each of the portions 8|. having a pairof uniplanar surfaces 82, each surface forming with a correspondinguniplanar surface of its adjacent projection a support for a exiblemember or reed valve 84. In the embodiment illustrated, there are fourprojections 8| which form the supports vand valve seats for f9i1requally spaced reed valves or members 84. 'Ihese valves 84 are securedat their uppermost extremities to the member 16 by means of screws 88leaving the lower portions of the reeds in position to be readily flexedby the decreased pressure coupled with the velocity of air passingthrough the carburetor. The venturi 18 is formed as an integral part ofmember 16, being supported by means of webs 86 connecting portions 8|integrally with the venturi 18. 'Ihe venturi 18'arranged above and inaxial alignment with venturi 18 is formed as an integral part of member16 being supported by means of webs 81 connecting the venturi 18 withthe venturi 18. The interior surface of the flanged portion 11 formed onmember 16 is curved as illustrated at 88 in Figures 4 and 5, so thatwhen the reeds 84 are flexed outwardly as illustrated in Figures 5 and6, they form in effecta third venturi 'resulting in an increased airvelocity at the depending portions of the reeds. The reed valves andsupporting structure are preferably arranged lso that the reeds-areequallyspaced from the axis of the venturis 18 and18 so thatsubstantially the same amount of air passes on one side between theventuris and a flexible reed as passes between the venturi and any ofthe other reed valves. 'I'he reed valves are therefore in eiect placedconcentric with the axis of the venturis 18 and 18 so that the axis -ofthese venturis is substantially the vcentral axis of the air streampassing through the carburetor.

1n the embodnnent illustrated, the arrangement includes-primaryandsecondary nozzles for the injection offuel linto the mixing passage,The nozzlestructure is shown per se in Figure 10 and in assembledrelation in the carburetor in Figures 2 and 3. As illustrated, thearrangement comprises a member 88 generally rectangular in cross sectionand having a primary nozzle 8| and 'a secondary nozzle 82 formedtherein, the lower portion o f the member 88 being circular and flangedas at 88. The extremities of vmember 88 adjacent the nozzles 8| and82-are tapered or form an apex by the intersection of angularly arrangedsurfaces 84 as shown in Figures 10. and

14 in such manner as to virtually increase the area of the nozzle outletfacilitating the flow of fuel. The nozzle structurel 88 passes throughan opening in the side wall of the -carburetor body and through a slot88 in member 16. It is to vvbe noted that the extremity of the primaryjet 8| terminates substantially at the' axis of the Venturi constructionwhile the secondary jet 82 cylindrical bore 88, the inner extremityofwhich ber 88 whichis provided at its upper end withl a flange 88 and anannular recess |88. The member 88 is formed -with a central bore |82extending partially through the member and terminating in a restrictedopening |88, which in turn communicates with an enlarged bore |84 in theother end of the member 88, the innermost portion of bore |84 beingconical in conguration in its connection. with the restricted bore |88as illustrated in Figure 13. 'Ihe member 88 is formed with twolongitudinally extending, laterally spaced bores or channels and l |86extending entirely through the member 88. Member 88 is also providedwith circumferential spaced grooves |81 and |88, the portions of member88 on either side of groove |81 being threadedas at ||8 and There isalso provided a comparatively small transverse channel ||2 leading fromthe recess |88 into the central .bore |82. The groove |81 is incommunication with the central bore |82 by means of transverse channel|86.

-The lower extremity of member 88 is formed with a laterally extendingkerf or slot I4 adapted to receive a suitable tool in order to assemblethe restriction |88 in member 88. lThe member H5 isiprovided with astuillng gland 8 so as to prevent leakage of fuel from the chamber 86.The metering pin ||1 is provided with a transversely extending portion|28 serving as suitable manipulating means for adjusting the metering pin to regulate the amount of fuel passing .to the main or primary nozzle8|; 'I'he space between the member ||5 and member 88 forms achamber |22adapted to receive fuel from the float bowl 16 through a channel |28 asshown in Figures 3 and .14. It is to benoted that 'the channel leadingto the secondary nozzle 82A is provided with a restricted entrance |24for a purpose to be hereinafter explained. The tubes or channels-leadingto the nozzles 8| and 82 are in communicationby means of a transversechannel |25. 1

The arrangement of providing a mixture for idling of the engine will'nowbe described.'2lt is to bel noted that the groove orannularjcha'nnel |88is filled with fuel from the float bowlfitbeing incommunication-therewith by means of openthe latter receiving its fueldirect from the float 5 bowl by means of passage |28, The recess or an-.vnular channel |88 is in registration with horizon Figures 8 and 15.VThev channel |28' is in com-` f munication with a vertical channel |88which is contained within a vertical boss portion |3| illustrated inFigure 1. 'I'he upper end of the channel |38 is provided with a bushing|3|' having a re' stricted opening |82 which admits fuel to a smallchamber |88, the latter -being a threaded bore in the side of thecarburetor body and is closed by means of a threaded member |84 havingav needle or metering pin |88 which projects into an opening |86 Iasillustrated in Figure 8. The

threaded member |34 is provided with a knurled head portion |31 foradjusting the position of the needle |35 in the opening |36, a spring.|38 being interposed between the head |31 and the boss portion onthecarburetor body to exert a degree of friction upon the threaded memberso that the same will be frictionally held in adjusted position.

'I'he air supply for forming the.idling mixture is obtained from theinterior of the main air passage through the medium of a slot I4|contained in the side wall of the portion of the carburetor body whichregisters with a vertical bore |42 in` the portion I8 of the carburetorbody, this arrangement being shown in detail in Figure 8. The chamber|33 in which the fuel and air are brought together to form an idlingmixture communicates with one end cfa laterally extending channel |44the other end ofthe channel being 'in communication with a substantiallyvertical channel |45 as illustrated in Figure 6, there being a Abushing|41 at the entrance of channel |45 having a comparatively small openingtherein acting as a restrictionto the flow of fuel mixture throughchannell46. The channel |45 in body portion lli of the carburetor is inregistration with a channel |48 contained in portion I2 of thecarburetor body which terminates in a rangement of opening |52 being.such that when the throttle valve disk 4|'is in idling or nearlyclosed'position, the peripheral edge of the valve partially covers theopening |52. The idling mix- Ature passes through orifice l5i, a furtherpartial opening of the throttle valve 4| causes the opening |52 tosupply additional fuel and air mixture from the chamber .|48 into the-main mixing passage until the velocity of the air p'assing through themain mixing passage has reached a suiiicient value under the influenceof the' acceleration of the engine to cause the main or primary jet 8|to discharge fuel into the main mixing passage. A The bushing |41lforming therestriction by means of an opening smaller than the channel|46 and channel |44 is utilized to aid in breaking up the particles offuel in the.idling mixture, thus further atomizing the fuel to provide abetter and more homogeneous idling mixture forl delivery from the orices|5| and |52. 'Ihe screw |34 may be adjusted so that the needle |35. willcon-,'- trol or regulate the amount of air admitted to the chamber |33where it is mixed with fuel from channel |38 through restriction |32 toprovide the fuel mixture to be supplied through orifices |5| and |52 asabove set forth. l

- It is desirable in a carburetor of this character t'o incorporatemeans for `momentarily injecting additional fuel into the mixing passagewhen the internal combustion engine is accelerated. To this end,- thereis provided a cylindrical chamb er. |55 formed adjacent the-float bowll5 in x, which is reciprocably positioned a piston rod |51 having at itslower extremity a member |58 which is' snuglyfitted upon'a reducedportion |58 of the rod |51. Interposed between member |58 and a washer|58 which is positioned on rod |51 is a piston |5| fabricated of leatheror other suitable material. In order to cause the leather piston toremain in close contact with the walls of the chamber i 5 5, an annulargroove |52 is formed and 7.

in member |58 and a circular coil spring is inserted in the groove |62and urges the piston leather outwardly into contact with the walls ofthe cylinder. The upper extremity of the piston rod |51 projects throughan opening in a cross arm |54, the cross arm being riveted as at |65 toan actuating shaft |66 reciprocably mounted in a bore in a verticallypositioned boss |61 formed in the float bowl chamber. The upper portionof the piston rod |51 is provided with an annular groove (not shown)which receives a hairpin clip |56 so as to maintain a cooperativerelationship between the vcross arm |64 and the spring |15 in a mannerto be hereinafter explained. The lower end of the shaft |55 is bored toreceive the end |68 of a link |68, the link being pivotally connected`to the shaft by means of a cotter pin |18. The lower end of the link|58 is bentat right angles and projects through an opening |1| formed inthe end of the arm 68, the latter being flxedly secured to the polygonalextremity |12 of the throttle supporting shaft 38 as illustrated inFigures 1 Interposed between the disk |60 and the arm |54 andsurrounding piston rod |51 is an expansive coil spring |15 which servesto normally urge the piston |6| away from the cross arm |54 and servesto cause a flow of fuel to an acceleratingjet or orifice in a mannerhereinafter to be explained.

'I'he lower end of the cylinder |55 terminates in -a channel |16 whichcommunicates with the float bowl by means of a channel |11 shown inFigures 4 and 14. The upper portion of the channel |15 is enlarged as at|18 and accommodates a ball check |18 which serves to close the channel|15 when piston |6| is forced downvwardly but serves to admit thepassage of fuel from Athe float bowl through channels |16 andv inder oraccelerating well |55 is a transversely arranged channel 8| whichintercepts avertical channel |82, (see Figures 6 and 7) the latterterminating in a slightly enlarged chamber |83 in the upper portion ofwinch is positioned a bushing |84 having a channel |85 therethrough, a.ball check |85 being arranged in chamber |83, these channels beingcontained within body portion I8 of the carburetor. The channel |85 inbushing |84 is in registration with a passage |81 at the entrance ofwhich is interposed a iine mesh screen |88 for the purpose of'preventingforeign particles that may be present in the fuel from reaching thedischarge orifice. A'1"he passage |81 communicates with a chamber |88formed in the upper portion of the carburetor body, the walls of whichare threaded and receive i of the carburetor body is bored to receive atubular member |8| which is pressedor otherwise secured in the bore inthe'side wall oi the mixing passage, the tube'A depending angularly andhaving at its extremity a small opening forming a restrictedfueldischarge orifice |82, the orifice terminating adjacent a restricted.portion of the main mixingpassage, viz., at a point of high airvelocity adjacent the flange 11 so that an effective vsuction is presentserving to withdraw fuel from the orifice |82. Thus, when the engine isto be accelerated the throttle is moved to an open position depressingshaft |66, cross arm |64, which compresses the spring |15 tending tourge the piston downwardly. Under the loading of the pressure in thespring |15, the'piston moves downwardly forcing fuel from thechamber |55through channelsv |0|, |02,- |00, |05, |01 and |9|,

thence through orice |92 and is discharged into tering the fuel chamber|55, sothat'upon subse quent accelerating movement of the throttle thesechannels are already illled with fuel so that practically instantaneousextrusion of fuelthrough the oriilce |92 takes place under the springpressure exerted upon the piston |0| whenever slight downward movementof the cross arm |00 and shaft |00 takes place by slight openingmovement` of the throttle. r

To obtain full power at open or nearly open throttle position it isdesirable that the carburetor deliver additional fuel to the mixingpassage in excess of the amount which will pass through the primary ormain jet 9| and the secondary jet 92. To obtain this result thecarburetor of our invention is formed with a boss portion 200`vertically bored to receive a shaft 20|, thev latter being reciprocablymounted in the bore. The lower portion of shaft 20| is reduced l in sizeto form a tenon 202, which normally contacts with a ball check member203 arranged in the upper end of. an enlarged bore orl chamber 204, theball check 203 being heldin its uppermost position under the influenceof an expansive spring 205, the spring being held in place and the lowerentrance to the chamber being closed by means of a threaded plug 200.Ther I chamber 200 is in communication with a transversely extendingchannel 201 which communicates with a channel 200 leading into thechamber formed by recess |01 in the fitting or member 90..

Diametrically opposed openings |00' permit the fuel in recess |01 toflow into the main or primary jet 9|. Q

When the throttle has been moved to open or nearly open position, thecross arm |00 is thereby depressed and engages the upper extremity ofthe shaft 20| depressing the latter, the tenon 202 of which pushes theball check m away from its seat and permits fuel to flow through channel|09 leading from' the float bowl into the chamber 200, channels201 and200, recess |01, openings |00', thus supplying additional fuel directfrom the float bowl through the above mentioned channels direct to themain nozzle 9|. Such an arrangement in effect by-passes the fuel channelcontrolled'by the metering pin` ||0 so that when,

- power is needed with the throttle toward well Thegeneral operation ofthe carburetor of our invention is as follows:

At low or idling speeds with the throttle in substantially closed oridling position thefuel for the idling mixture passes from the fluidchamber l0 through opening |29 to the chamber |22 -thence past themetering pin ||0 through channel |02, e ||2 to the annular channel |00,thence through channels |20 and |00 to chamber |30 where'it is mixedwith air entering through the slot |0|, the mixture then passing throughchambers .|00 and |00 to the chamber |09thence through the opening |5|into the mixing passage. In the idling position of 'the ,throttle valve,the fuel mixture is extrudedthrough the lowermost opening |5|. Uponslight partial opening of the. throttle, both of the orifices |5| and|52 deliver fuel mixture to the mixing passage. As the throttle isfurther opened the engine speed is increased and the suction increasesin the mixing passage and the primary or main jet v9| begins to deliverfuel into the mixing passage atthe central axis-of the small venturi 19.At the' time the mainvjet 9| delivers fuel into the passage,

A the reedfvalves, due to air velocity and decreased pressure within themixing passage will be caused to open slightly so as to permit anincreased amount of air to pass through the mixing passage and in thismanner prevent an overenrichment of fuel mixture passing to the engine.As the speed of the engine increases, the suction increases andtherefore the proportionate degree of opening of the reeds is increasedto accommodate the flow -of air andl fuel through the Vmixing passages.During the operation of the engine at compara- -tively high speed, inorder to maintain a proper mixture ratio, the secondary jet 92 is causedt0 I come into operation and deliver additional fuel into the mixingpassage in order'to maintain a substantially balanced mixture ratio offuel to air. As the reeds open they assume a curved configuration whichthey attain under the rapidv passage of air as illustrated in Figure 4,which configuration provides in effect a thirdventuri, thus ob-v taininga maximum flowof air through the open-,-

ing ail'orded by the ilexure of the reed valves and.`

at the same time maintaining a high air velocity. This type ofcarburetor because of the variable effective-area of mixing passagemakes possible the utilization of a single -carburetor for various typesand sizes of internal combustion engines as the flexible wall passageaccommodates the varying volume of fuel -mixture required. v

The operation of the accelerating well and power jet have beenhereinbefore explained.

It is apparent that, within the scope of the in vention modificationsand different arrangements may be made other than is herein disclosed,and the present disclosure is illustrative merely, the inventioncomprehending all variations thereof. A What we claim'isz.

. 1. In a carburetor,` in combination, a mixing passage; `a plurality ofaxiallyaligned venturls substantially centrally arranged in saidpassage;' a fuel discharge nozzle terminating substantially in alignmentwith the axis of said venturis, the extremity of the nozzle being anapex formed by intercepting v angularly arranged surfaces;' a

venturis arranged in said passage; a plurality of flexible reed valvespositioned adjacent said venturis and substantially equally spaced fromthe axis of said venturis, said valves normally reity of reed valvespositioned exteriorly of said 4. In a carburetor, in combination, amixing passage; a plurality of venturis substantially centrallypositioned in said mixing passage; a pluralventuris and substantiallyequidistant from the central of one of said venturis; and a fuelejecting nozzle angularly positioned with respect to the axis of one ofsaid venturis and terminating adjacent thereto.

5. In a carburetor, in combination, a mixing passage; a plurality ofaxially aligned venturis in said passage; a plurality of flexible reedvalves positioned surrounding said venturis and equidistant from theaxis of said venturis, the relatively movable ends of said valvesterminating at the extremity of one of said venturis, said valvesnormally restricting the ow of air to around said `venturis, said valvesadapted to flex to permit additional air to pass through said mixingpassage.

6. In a carburetorin combination a fuel supply chamber; av mixingpassage; a removable member normally supported in said mixing passage,said member including a plurality of axially aligned Venturi tubes ofdifferent sizes; a plurality of fuel discharge nozzles terminatingadjacent the axis of said venturis; a plurality of turi delivers; aplurality of flexible plates sur-V rounding said venturls; a pluralityof fuel discharge nozzles terminating in said mixing passage; one ofsaid nozzles terminating. in substantial alignment with 4the axis ofsaid venturis and means for regulating `the flow of fuel to one of saidnozzles.

8. An air controlling means for a carburetor mixing passage including incombination a member having a skeleton structure formed with contonstructure, each of said walls adapted to engage some of said convergingportions; said ilexible walls adapted to be flexed outwardly Whereby anincreased amount of air is enabled to pass around said venturi.

9. In a carburetor, in combination, a mixing passage; a frame positionedin said mixing passage; a venturi substantially centrally positioned insaid mixing passage supported by said frame';,'v a plurality of flexiblevalves carried by said frame` and arranged outside of said venturi, saidvalvesr being spaced equally from said axis of said venturi; primary andsecondary fuel discharge nozzles projecting through said frame andterminating adjacent said Venturi axis; and means for regulating theflow of fuel to said primary nozzle.

1i). In a carburetor, in combination, a fuel supply chamber; a mixingpassage; a removable frame structure normally supported in said mixingpassage; said frame structure including a plurality of aligned Venturitubes of diiferent sizes; a plurality of fuel discharge nozzlesterminating substantially adjacent the axis of said\ venturis, said fuelnozzles receiving fuel from the fuel supply in said chamber; said framestructure including a plurality of sets of converging uniplanar surfacesspaced about the axis of said venturis; and a plurality of flexible reedvalves adapted to contact with said sets of uniplanar surfaces forregulating the amount of air passing through said mixing passage.

11. In a carburetor, in combination, a body formed of at least threeconnected sections; a plurality of heat resisting elements interposedbetween two sections; a fuel supply chamber adjacent to said centralsections, said sections having hollow aligned portions forming a mixingpassage; a tube communicating between said fuel supply chamber and anupper section of said carburetor body whereby said fuel supply chamberis vented from said mixing passage; an air regulating valve journalledin the upper section of said carburetor body; a venturi positioned in anintermediate section of said carburetor body; a fuel nozzle adapted todischarge fuel adjacent said venturi, said nozzle adapted to receivefuel from said fuelchamber; a plurality of flexible valves positionedabout the axis of said venturi and adapted to flex; and a throttle valvejournalled in a section of said carburetor body.

12. In a carburetor in combination of a mixing passage; means fordelivery of fuel into said mixing passage comprising a primary andsecondary unitary jet construction including a member having asubstantially rectangular cross section., said member terminating at oneextremity in a flanged portion; a pair of juxtapositioned channels insaid member, the extremities of said chan- Anels opposite the flangedend of said member forming fuel delivery outlets for said mixingpassage. O

13. In a carburetor, a mixing passage; a member arranged in said mixingpassage; a venturi arranged in said mixing passage and integrally formedwith said member; a plurality of convergingly arranged flexible reedvalves positioned adjacent to andvsubstantially equally spaced from theaxis of said venturi, one end of each of said re'ed valves being xedlysecured to said member i the other end of -each of said reed valvesterminating at the extremity of said venturi.

EARL A.' RULLISON. HOWARD B. SIMMONS.

